Sometimes it takes 1 hour and sometimes it takes like 24+ hours.
Not all that long ago it used to be several weeks.
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https://mtgox.com/press_release_20120808.htmlJust know, it isn't Dwolla that is taking any time. Account-to-account (A2A) transfers on Dwolla are immediate. So when there is a delay it is because Mt. Gox has not sent the API request to Dwolla to make the transfer.
They have limits as to how much Dwolla funds they can add apparently, so they cannot simply just keep enough Dwolla funds to be able to accommodate every withdrawal request. Of course, when there is a price spike up there is a flock of people cashing out their coins and withdrawing, so I'm suspecting that's when the lag will be the longest.
